Human Eye and the Colourful World — Class 10 Science MCQs

NCERT | CBSE Curriculum

Practice 100+ MCQs on Human Eye and Colourful World for Class 10.
Learn about Eye structure, myopia, hypermetropia, dispersion, rainbow, Tyndall effect & blue sky.
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Quick Revision: The Human Eye and the Colourful World

  • Power of Accommodation: Eye's ability to adjust focal length to see near and distant objects clearly.
  • Near Point (Least Distance of Distinct Vision): Minimum distance for clear vision (~25 cm for normal eye).
  • Far Point: Farthest point of clear vision (infinity for normal eye).
  • Myopia (Near-sightedness): Image forms in front of retina; corrected using concave lens.
  • Hypermetropia (Far-sightedness): Image forms behind retina; corrected using convex lens.
  • Presbyopia: Age-related weakening of ciliary muscles; corrected using bifocal lenses.
  • Cataract: Clouding of eye lens; treated surgically.
  • Dispersion: Splitting of white light into seven colors (VIBGYOR) by a prism.
  • Spectrum: Band of colors obtained after dispersion.
  • Rainbow: Natural spectrum caused by dispersion of sunlight by water droplets.
  • Atmospheric Refraction: Bending of light due to varying air density; causes twinkling of stars, advanced sunrise, delayed sunset.
  • Twinkling of Stars: Due to atmospheric refraction of starlight; planets do not twinkle (extended source).
  • Scattering of Light: Redirection of light by particles; explains blue sky, red sunrise/sunset, Tyndall effect.
  • Tyndall Effect: Scattering of light by colloidal particles making the beam visible.
  • Why Sky is Blue: Fine atmospheric particles scatter blue light more than red.
  • Why Sun is Red at Sunrise/Sunset: Blue light scattered away, leaving longer wavelength red light.
  • Danger Signals are Red: Red light is scattered least, travels farther through fog/smoke.
  • Angle of Deviation (Prism): Angle between incident ray and emergent ray.
  • Angle of Prism: Angle between two refracting surfaces.
  • Prism Formula (Minimum Deviation): n = sin[(A+δₘ)/2] / sin(A/2).

External Resources: Byjus - Human Eye and Colourful World | Khan Academy - Human Eye

Chapter Summary: The Human Eye and the Colourful World

Human Eye and Colourful World MCQ Class 10 connects the physics of light with the biology of vision and the phenomena we observe in nature every day. We learn how the eye functions like a camera, the common defects that affect vision, and how lenses correct them. We also explore how light interacts with prisms and the atmosphere to create stunning effects like rainbows, blue skies, and red sunsets.

We study the structure of the human eye, accommodation, myopia (near-sightedness), hypermetropia (far-sightedness), and presbyopia. We understand dispersion of white light, the Tyndall effect, scattering of light, and atmospheric refraction which causes twinkling of stars and advanced sunrise.

This chapter is highly scoring with diagram-based questions, numerical problems on lens power, and conceptual explanations of natural phenomena. Regular practice builds confidence in answering both theoretical and application-based questions with clarity.